The use of a large shaft creates an optimum fluid displacement through adjustable blow off valve in compression to control unsprung mass in the JRZ Suspension RSpro3 BMW Performance Part F87 M2 (2015 – ) Complete Kit. A specially-designed piston is used to filter out the large, high velocity movements seen with suspensions on street applications for tighter control and better use of power. This product is entirely available by made to order process only. Available for purchase through Olsen Motorsports.